SUMMARY Selenium (Se) is an essential trace element with diverse physiological functions related to cellular homoeostasis, body metabolism and antioxidant defence. Se is an integral constituent of at least 25 selenoproteins in the body that regulate cellular redox and antioxidant defence enzymes systems control free radicles of reactive oxygen species . Dietary Se plays key role in immunity, growth and fertility in chickens, which require optimum levels in their diets to maintain high reproductive and productive performance of birds. In the last decade, dietary supplementation with selenium nanoparticles (SeNPs) has enhanced the growth performance, feed conversion ratio, reproductive performance, egg production, immune response and antioxidant status, as well as improved the quality of meat and eggs and promoted microflora. Se has been shown to increase relative weights of immune-related organs (burse and thymus) to enhance immunity. Feeding Se-NPs can improve antioxidant status and glutathione peroxidase activities in both broilers and layers. Use of Se-NPs at 0.9 mg/kg diet in broilers improved the intestinal health via increasing the population of beneficial bacteria and producing short-chain fatty acids. This review focuses on the significance of SeNPs in poultry industry and provides insights about its comparative advantages over conventional sources of Se in poultry diets.

中文翻译：

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硒纳米颗粒在家禽营养中的营养作用：综述

总结硒 (Se) 是一种必需的微量元素，具有与细胞稳态、身体代谢和抗氧化防御相关的多种生理功能。硒是体内至少 25 种硒蛋白的组成部分，这些硒蛋白调节细胞氧化还原和抗氧化防御酶系统，控制活性氧自由基。日粮硒在鸡的免疫、生长和繁殖方面起着关键作用，需要在它们的饮食中达到最佳水平，以保持鸟类的高繁殖和生产性能。在过去的十年中，硒纳米颗粒 (SeNPs) 的膳食补充剂提高了生长性能、饲料转化率、繁殖性能、产蛋量、免疫反应和抗氧化状态，并改善了肉类和鸡蛋的质量并促进了微生物群落。硒已被证明可以增加免疫相关器官（法氏囊和胸腺）的相对重量，以增强免疫力。饲喂硒纳米颗粒可以改善肉鸡和蛋鸡的抗氧化状态和谷胱甘肽过氧化物酶活性。在肉鸡日粮中使用 0.9 mg/kg 的硒纳米颗粒通过增加有益细菌的数量和产生短链脂肪酸来改善肠道健康。本综述侧重于硒在家禽业中的重要性，并提供了其与家禽日粮中传统硒来源的比较优势的见解。肉鸡 9 mg/kg 日粮通过增加有益细菌的数量和产生短链脂肪酸来改善肠道健康。本综述侧重于硒在家禽业中的重要性，并提供了其与家禽日粮中传统硒来源的比较优势的见解。肉鸡 9 mg/kg 日粮通过增加有益细菌的数量和产生短链脂肪酸来改善肠道健康。本综述侧重于硒在家禽业中的重要性，并提供了其与家禽日粮中传统硒来源的比较优势的见解。